138387500 has 36 divisors (see below), whose sum is σ = 302730624. Its totient is φ = 55350000.

The previous prime is 138387479. The next prime is 138387523. The reversal of 138387500 is 5783831.

It is a super-2 number, since 2×138387500² = 38302200312500000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6965 + ... + 18035.

It is an arithmetic number, because the mean of its divisors is an integer number (8409184).

Almost surely, 2^138387500 is an apocalyptic number.

138387500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138387500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151365312).

138387500 is an abundant number, since it is smaller than the sum of its proper divisors (164343124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138387500 is an equidigital number, since it uses as much as digits as its factorization.

138387500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11100 (or 11078 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 138387500 is about 11763.8216579477. The cubic root of 138387500 is about 517.2481601921.

The spelling of 138387500 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, five hundred".